Lower bound on e+e- decay of massive neutrinos

Details Lower bound on e+e- decay of massive neutrinos Lower bound on e+e- decay of massive neutrinos

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988lbee.rept.....c&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Astronomy, Neutrinos, Radioactive Decay, Supernova 1987A, Constraints, Cosmology, Hubble Constant, Ionizing Radiation, Light Curve, Line Spectra, Particle Interactions, Universe, X Ray Sources

Scientific paper

Astronomical observations of SN1987A, such as the light curve, spectral intensities of lines, the X-ray emissions, etc., constrain the lifetime for the decay of a heavy neutrino 1 MeV less than or equivalent to m sub nu H less than or equal to 50 MeV through nu sub H yields nu sub 1+e(+)+e(-) exceeds 4 x 10 to the 15th exp(-m sub nuH/5MeV) seconds. Otherwise. resulting ionization energy deposits and stronger X-ray emission would have been observed. This coupled with traditional cosmological considerations argues that the lifetime of tau-neutrinos probably exceeds the age of the universe. This in turn would imply the standard cosmological mass bound does apply to nu sub tau, namely m sub nu sub tau less than or equivalent to 100 h squared eV (where h is the Hubble constant in units of 100 km/sec/mpc). The only significant loophole for these latter arguments would be if nu sub tau primarily decays rapidly into particles having very weak interactions.

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